[OPENENGSB-3786] refactor xlink
[OPENENGSB-3786] fix checkstyle and missing license errors
Merge pull request #906 from stfnsche/master

[OPENENGSB-3786] refactor xlink
[OPENENGSB-3790] Improve multipleValueSeparator used in UserProjects
LDAP connector
[OPENENGSB-3796] Create a JIRA authentication connector
[OPENENGSB-3799] Add JIRA authentication connector module to the parent
[OPENENGSB-3800] Integrate JIRA authentication connector into the
assembly
[OPENENGSB-3802] Create a JIRA userprojects connector
[OPENENGSB-3805] Add JIRA userprojects connector module to the parent
[OPENENGSB-3806] Integrate JIRA userprojects connector into the assembly